Anything that creates a blockage of the intestinal tract. You may think of the intestinal tract (stomach, small bowel, large bowel) as somewhat akin to a garden hose. If you kink the garden hose, or twist it, or block it inside, you have created an "obstruction". Most obstructions are a results of previous surgery and most of these resolve with non-operative management.
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2

Yes:
Bowel obstruction can cause lab changes in the long term and a duodenal erosion unless is bleeding would not cause a significant lab change. I am not sure that the information you provide is specific enough to understand the whole picture. If you are home, most likely you do not have a bowel obstruction. Please see a doctor
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3

Location:
Duodenal cancers are rare ~ 1% of GI cancers. Tumors near the ampula may cause symptoms by obstructing the ducts leading to jaundice, pancreatitis and pain in other locations the lesion may cause symptoms of duodenal ulcer, i.e., pain or manifest by infiltrating surrounding organs.
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4

Burning pain, nausea:
Gnawing pain, discomfort that persists, nausea, general malaise....Pain may be in mid upper abdomen, but also could radiate toward the sides, and even thru to the back. If take simple over the counter antacids and it goes away, fine. But if it persists, and you have to keep taking them daily, not fine. Get thee to the doc.
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6

About the same:
Regardless of size or location, if you really have an ulcer (found by x-ray or endoscopy) please seek doctor's advice. Even small ulcers can bleed (sometimes massively), perforate, obstruct stomach emptying. Sometimes, an ulcer can form in a cancer so to avoid this possibility it is important to make sure at least gastric ulcer actually heals. Relief of ulcer symptoms doesn't always mean healing.
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7

See details:
The symptoms are quite similar. Epigastric pain, bloating, nausea, abdominal tenderness are possible symptoms. Food may help but consider seeing a GI specialist and starting meds to help heal the ulcer.
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